the Ottoman side was the French émigré and engineer officer Phélippeaux, one of Bonaparte's classmates at the École Militaire. Phélippeaux ordered cannon to be placed in the most advantageous positions and new trenches dug as if by magic behind the ruins which Bonaparte's forces had captured. At the same time Sidney Smith, commander of the British fleet, and his ships' crews landed. These factors renewed the courage of the besieged and they pushed Bonaparte's force back, with stubborn fury on both sides. Three final consecutive assaults were all repulsed, convincing Bonaparte that it would be unwise to continue trying to capture Acre. He raised the siege in May and consoled his soldiers with the proclamation: After feeding the war for three months in the heart of Syria with a handful of men, taking forty guns, fifty flags, 10,000 prisoners, razing the fortifications of Gaza, Kaïffa, Jaffa, Acre, we shall return to Egypt. Retreat from Acre The French force's situation was now critical – the enemy could harass its rear as it retreated, it was tired and hungry in the desert, and it was carrying a large number of plague-sufferers. To carry these sufferers in the middle of the army would spread the disease, so they had to be carried in the rear, where they were most at risk from the fury of the Ottomans, keen to avenge the massacres at Jaffa. There were two hospital depots, one in the large hospital on Mount Carmel and the other at Jaffa. On Bonaparte's orders, all those at Mount Carmel were evacuated to Jaffa and Tantura. The gun horses were abandoned before Acre and Bonaparte and all his officers handed their horses over to the transport officer Daure, with Bonaparte walking to set an example. To conceal its withdrawal from the siege, the army set off at night. Arriving at Jaffa, Bonaparte ordered three evacuations of the plague sufferers to three different points – one by sea to Damietta, one by land to Gaza and another by land to Arish. During the retreat the army picked clean all the lands through which they passed, with livestock, crops and houses all being destroyed. Gaza was the only place to be spared, in return for remaining loyal to Bonaparte. To speed the retreat, Napoleon suggested the controversial step of euthanizing his own soldiers who were terminally ill with plague (between 15 and 50, sources vary)